Fan Selection and the Hidden Cost of the Wrong Operating Point
One of the most expensive mistakes made in industrial facilities and HVAC systems is relying solely on the flow rate value for fan selection.
This approach, frequently encountered in the field, leads to serious operational and maintenance crises shortly after the system is commissioned. Most of the time, the problem lies not in the fan’s manufacturing quality, but in forcing it to operate outside its design point.
A selection that is not analyzed correctly manifests itself through symptoms such as noise, performance loss, motor overheating, and bearing failures.
System-Clogging Effects of the Wrong Operating Point A fan’s operating point is the critical intersection where the fan performance curve meets the system resistance curve. When system resistance is not calculated correctly, the fan strays from its best efficiency point and drifts into an unstable region. This causes deterioration of the aerodynamic structure, turbulence, and irregular forces on the impeller. Consequently, the facility faces heavy costs such as unexpected unscheduled downtime, surging electricity bills, and premature component replacements.
Critical Engineering Parameters in Proper Fan Selection Making decisions by merely looking at flow rate and theoretical pressure from a catalog is not a sustainable method. For reliable and long-lasting operation, the actual system resistance created by all components—such as ductwork, filters, and dampers—must be precisely calculated. Additionally, corrections must be made for parameters affecting gas density, such as air temperature, humidity, and altitude.
The fan’s location on the curve must be verified, unstable regions must be avoided, and in cases where multiple fans will operate together, parallel or series interaction analyses must be performed.
Extend the Lifetime of Your Facility Investment An industrial fan possesses the mechanical durability to serve for decades under the right conditions. However, a device condemned to the wrong operating point can fulfill only a fraction of this potential lifespan. Fan selection is not a detail; it is the heart of the system.
As Asel Teknik, we stand by you with our expert engineering team in selecting the most suitable fan for your facility’s needs and throughout technical support processes.
To learn more about our custom solutions for your business, resolve questions regarding your fan selection, or request a technical analysis, you can visit our website or contact our expert team directly.